Alarm system.



No. 741,573. PATENTED' OCT. 13, 1903.

' E. H. BALLOJU.

ALARM SYSTEM.

APPLICATION IILBD AUG. 13, 1901.

H0 MODEL. r 2 SHEETS-$331111 1 m: Noam PEYERS co monnmm.v wnmuumn. v. c.

'PATENTED OCT. 13, 1903.

B. H. BALLOU.

2 SHEETS-SHEET 2,

ALARM SYSTEM.

APPLIUATION FILED AUG.13.. 1901.

N0 IODEL.

PEYER$ co, Puovuuwou WASHINGTON. n. c

m: NORRIS are. 741,573. Patented October 13, 1903.

UNITED STATES PATENT ()EEIcE.

ERNEST H. BALLOU, OF BINGHAMTON, NEW YORK, ASSIGNOR OE ONE-HALE TOERNEST II. BEARD, OF ACADEMY, WEST VIRGINIA.

ALARM SYSTEM.

SPECIFICATION forming part of Letters Patent No. 741,573, dated October13, 1903.

Application filed August 13, 1901. Serial No. 71,927. (No model.)

To all whom it may concern: 15 also tubular, all of the bars of thecells Be it known that I, ERNEST I-I. BALLOU, a and corridor of eachwing being connected in citizen of the United States, residing atBingseries and having connection with a reservoir hamton, in the countyof Broome, State of 16, which may be located beneath corridor-10 55 NewYork, have invented certain new and or any other suitable place, so thatthe series useful Improvements in Alarm Systems; and of bars may besupplied with air under pres- I do hereby declare the following to be afull, sure. With this arrangement if any one of clear, and exactdescription of the invention, the bars is cut or broken, as in theattempt of such as will enable others skilled in the art to a prisonerto escape, there will be a drop in 60 which it appertains to make anduse the same. pressure in the pipe connecting such bar withThisinvention relates to alarm systems, and its reservoir. To givewarning when this particularly to that class employed in connecdropoccurs, an alarm mechanism is provided tion with jails or safe-depositsfor giving an and consists of a head 17, which is connected alarm whenentrance thereto or egress thereto the pipe leading from the tubularbars to 65 from is forced. the reservoir, and this head is provided withThe object of the invention is to provide a diaphragm 18, carrying astud 19, which latsuch an arrangement that if the bar of the ter ispassed through an opening in a cap grating is cut or broken or a door isopened of the head and has a transverse contact-strip notice of thatfact will be given by the sound- 21 for engagement with thecontact-points 22 7o 20 ing of an alarm and the general location of and23 upon the cap. The points 22 and 23 the break will be indicated. areelectrically connected with bindingposts Further objects and advantagesof the in- 2i and 25, which are connected in the circuit vention will beunderstood from the following of a battery 26, which circuit alsoincludes description. one point of the enunciator 27. When the 75 25 Inthe drawings forming a portion of this air in the tubular bars is underpressure, the

specification, and in which like numerals of diaphragm 18 is pressedupwardly and raises reference indicate similar parts in the several thestud 19, with the strip 21, out of engageviews, Figure 1 is diagramshowing the cells ment with contacts 22 and 23 and holds it in in a jailequipped in accordance with thisinthis position, so that thebattery-circuit is 80 3o vention. Fig. 2 is a detail View, partly insecopen. When the bar is broken orcut, so that tion and partly inelevation and showing a the pressure drops, the diaphragm is forcedportion of a cell with the tubular bars and downwardly through themedium of ahelical with the door-hinges. Fig. 3 is a detail secspring28, disposed between itand the cap 20 tional view showing thecircuit-closure. Fig. and encircling the stud 19, and the strip 21 is 855 4 is an elevation showing a portion of the brought into contact withthe points 22 and front of a cell having a door equipped with 23 toclose the battery-circuit. This circuit hinges embodying the presentinvention. includes a bell, as is usual, and the enuncia- Referring nowto the drawings, there is tor indicates in which wingthe break has 00-shown in the diagram a jail which includes curred. 90

the three wings 5, 6, and 7, in each of which In a system of this kinditis alsoimportant is located a series of cells 8, in the front porthatan alarm be given if a door is opened, tion of the building being theoffice 9, while and for this purpose the door ofeach cell and in thecentral portion is the usual open corrithe door of each corridor areprovided with a dor 10. In each wing are two lines of cells, specialhinge. (Shown in Fig. 2 of the draw- 5 which are separated bya corridor11, the ends ings.) This hinge comprises a leaf 30, havof which areclosed by the gratings 12 and 13, ing a tubular pintle 31, which isdisposed in the grating 13 having a door 14 for entrance the socket 32of the leaf 33, said pintle at its to the corridor 11. In the presentinstance upper end communicating with the atmosthere is apassage-wayaround the whole numphere. The leaf 30 is attached to the door, ICO herof cells in each Wing. The bars 12 and 13 while the leaf 33 is securedto one of the bars are tubular, and each of the cells has its bars atthe side of the diaphragm. Leading to the socket 32 is a tube 34:, whichis connected by a nipple 35 with a T connection 36, which isincorporated in the tubing of the grating. The tube 34: opens into thesocket 32, and when the door is closed the pintle 31, which [its thesocket closely, closes the tube 3st and prevents escape otair therefrom.The pintle 31 has an opening 37 so positioned that when the door isopened this opening registers with the tube 3-1: to permit escape of airthrough the pintle, thus allowing the pressure to drop and the alarm tobe sounded. It will thus be seen that escape cannot be made either byopeningthe door or by cutting orbreaking the bar without notificationthereof being given.

It will be understood that in practice modifications of the specificconstruction shown may be made and that theinvention may be applied tosate-deposits, vaults, and other places from which people are to beexcluded.

WVhat is claimed is 1. The combination with an inclosure consisting oftubular bars connected in series, and a door, of a hinge including aleaf attached to the door and havinga downwardly-directed hollow pintlecommunicating with the atmosphere provided with a lateral port, asec-0nd leaf attached to a bar of the inclosure and having a socket in whichthevpintle is rotatably received, said socket having a port disposed forregistration with the port of the pintle when the door is opened, a pipeleading from the port of the socket to a bar of the inclosure, anairsupply connected with the bars of the inclosure for supplying airthereto under pressure, an alarm, a pneumatic circuit-closer connectedbetween the air-supply and the inclosure, and a batteryin circuit withthe alarm and the circuit-closer.

2. The combination with an inclosure comprising tubular bars, of a door,a hinge connecting the door and a bar of the inclosure, and means forsupplying air under pressure to the tubular bars, said hinge including avalve constructed and arranged to vent the tubular bars when the door isopened.

In testimony whereof I affix my signature in presence of two witnesses.

ERNEST I1. BALLOU. \Vitnesses:

ARTHUR BOGART, HARTWELL M. BALLOU.

